php 验证从 html 输入中删除数据

Question

我在使用 PHP 进行 html 输入验证时遇到了一些问题。验证本身正在运行。我有两个输入:姓名和办公室。如果我在名称输入上输入了一个值，但我没有为办公室输入输入值并单击提交按钮，办公室输入的验证有效但它清除/清空我在名称输入上输入的数据

我在这里做错了什么？

这是我的 PHP 验证:

if (isset($_POST['submit'])){
    $signatory_name = $_POST['sig_name'];
    $signtory_position = $_POST['sig_position'];

    if (!$_POST['sig_name']) {
            $errname='<div class="alert alert-danger">Sorry there was an error: Please Enter Your Name</div>';
        }

    if (!$_POST['sig_office']) {
            $erroffice='<div class="alert alert-danger">Sorry there was an error: Please Enter Your office</div>';
        }
}

这是我的html代码

<form action="signatory.php" method="Post" role="form">
<input class="form-control " id="signatoryname" name="sig_name" placeholder="Name:" >
<input class="form-control " id="signatoryoffice" name="sig_office" placeholder="Office:">
</form>

Answer 1

不太清楚你在做什么或试图做什么，但这是我的尝试:

首先:您应该知道 if (!$_POST['sig_name']) { 意味着如果分配的值为 FALSE，您可能需要重新考虑并使用 empty() 代替。

验证输入后，您需要使用提交的值重新填充表单 - 这是一个示例:

<?php

    $errname = "";
    $erroffice= "";
    if (!empty($_POST)) {   // Only if there are POST values attached.

        $signatory_name = $_POST['sig_name'];
        $signtory_position = $_POST['sig_position'];

        if (empty($_POST['sig_name'])) {
            $errname='<div class="alert alert-danger">Sorry there was an error: Please Enter youre Name</div>';
        }

        if (empty($_POST['sig_office'])) {
             $erroffice='<div class="alert alert-danger">Sorry there was an error: Please Enter youre office</div>';
        }
        if (empty($errname) && empty($erroffice)) {

             //Do whatever you need with the validated inputs...

        } else {
            //Expose the alerts:
            echo $errname.$erroffice;
        }
    }
?>


<form method="POST" role="form">
    <input class="form-control" id="signatoryname" name="sig_name" value="<?php echo (isset($_POST['sig_name']))?$_POST['sig_name']:""; ?>" placeholder="Name:" />
    <input class="form-control" id="signatoryoffice" name="sig_office" value="<?php echo (isset($_POST['sig_office']))?$_POST['sig_office']:""; ?>" placeholder="Office:" />

    <!-- rest of your form and buttons -->
</form>